Coaster-brake.



C. LUTZE.

COASTER BRAKE.

APPLICATION FILED DEG. a. 191s.

L12542 Patented Jan.19,1915.

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CARL LUTZE, 0F SCHNEBECK-ON-THE-ELBE, GERMANY, ASSIGNOR TO METALL- INDUSTRIE SCHNEBECK AKTIEN GESELLSCHAFT, 0F SCHNEBECK, GERMANY.

COASTER-BRAKE.

Application led December 3, 1913.

To all whom t may concern Be it known that I, CARL LUTZE, director, a subject of Germany, residing at Schnebeck-on-the-Elbe, Germany, have invented new and useful Improvements in Coaster- Brakes, of which the following is a specication.

The present invention relates to freewheel hubs for cycles of the kind in which a member attached to the sprocket effects by a screw action the coupling with the wheel hub at the one terminal position, and produces a braking action at the other terminal position, while at the intermediate position the wheel can turn free. For this a device is required which will prevent the nut of the screw action revolving with the sprocket, without being aXially displaced. According to the present invention this object is obtained in a peculiar manner by means of a` device, the essential part of which is a wire wound like the thread of a screw on the said sleeve, the one end of said coiled wire being secured to a stationary part of the hub and thereby prevented from revolving.

In the accompanying drawing a constructional form of the invention is exemplified in diagram, Figure l being a longitudinal section, Fig. 2 a cross section through the hub.

The sprocket a is rigidly fitted to the part b in a manner already known in the construction of free-wheel gears. This part b has a screw thread on which screws the sleeve c acting as a nut, so that when the sprocket is revolved, the sleeve c is axially displaced. At the terminal position on the right in Fig. 1 the sleeve c is coupled to the hub rl of the wheel by the engagement of friction cones. At the other terminal position on the left in Fig. 1 the cone at this end of the sleeve c engages on a corresponding cone at the end of the slit brake shell e, eX- pands this brake shell and brakes the wheel hub d by its contact with the brake shell, which is prevented from revolving relatively to the fixed spindle f.

For preventing the sleeve o from revolving freely with the screw b without being Specification of Letters Patent.

Patented Jan. 19, 1915.

Serial No. 804,362.

the sprocket is turned in the ahead direction,

thereby a slight friction is produced in the wire coil which tends to open the wire coil rigidly held at g e. Before this friction is overcome the sleeve c is axially displaced, and thereby coupled to the hub cl of the wheel. When the sprocket wheel is stopped, the frictional action of the rotating hub shell d tends to rotate the sleeve c in the same direction. This rotation, however, is prevented by the action of the screw b to which, as stated thereinbefore, the sprocket wheel is rigidly fitted. Therefore, when the sprocket wheel is stopped and the screw b is prevented from rotating the action of the thread throws the sleeve c out of engagement with the hub shell el.

The braking of the hub shell is effected by back-pedaling the sprocket wheel. This action causes the neck lz to rotate underneath the wire coil g in an opposite direction to that indicated by the arrow in Fig. 2, thus producinga friction which tends to tighten the wire coil g, whereby a further displacement of the sleeve c toward the brake shell e is effected, which movement causes said brake shell to expand, thus braking the hub (Z. During the displacement of the sleeve c the end g of the wire coil slides in the slot e of the brake shell.

It is obvious that the wire coil may also g3 mamme thereto, said sleeve 'being provided with hub name to this specification in the presence of engaging and brake sleeve engaging means, tWo subscribing Witnesses.

and a Wire coiled around said sleeve and having one of its ends engaging the slot in CARL MTZE' E) said brake 'sleeve whereby .it is held 'agains's YVitnesses:

rotation. ERNEST LIPKS. In testimony whereof I have signed my L. OCHLMAN-N.

Copies of this patent may be obtained for ve cents each, by addressing the Commissioner of Patents:

Washington, D. G. 

